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DOE OSTI · 1614059

Electrochemical-Reaction-Driven Interfacial Stress in a Solid-Solid Layered Architecture

Hao, Feng·Wang, Wenxiu·Mukherjee, Partha P.
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Abstract

Reaction-driven interfacial growth causes significant strain in layered architectures accompanied by mass transfer and moving boundaries. We present an analytical construct of the stress generated in a multilayer film, which incorporates the elastic-plastic strain of the growth layer, which suggests its strong dependence on the mechanical properties and thickness. This analytical formalism is further applied to a layered all-solid-state lithium battery architecture. This study demonstrates that mechanical stability can be enhanced by using a positive electrode material with high stiffness, porous hosts for lithium plating, and small external elastic constraints to buffer the volumetric changes in the electrode material. Furthermore, our results also reveal that small surface flaws in the solid electrolyte and high internal hydrostatic pressure can alleviate lithium dendrite growth through surface cracks.

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25 ENERGY STORAGEBatteriesChemical depositionElectrochemistryEnergy storageMultilayer thin filmsPhysicsStrainStressSurface & interfacial phenomena

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Hao, Feng, Wang, Wenxiu, Mukherjee, Partha P.. 2019-03-15. Electrochemical-Reaction-Driven Interfacial Stress in a Solid-Solid Layered Architecture. https://doi.org/10.1103/physrevapplied.11.034038

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